(I know he isn't technically a part of dream anymore but shut up okay I'm still sad and I love him so I'm gonna keep putting him until my heart is ready)
Mark would be freaking the fuckkk out. He'd ask you so many questions beforehand about what kind of people they are and what he should do/say. If you have siblings and/or pets that live at home then he'd worry about how to act around them too. He really just wants to make a good first impression because he really loves you and wants your family's approval. You calm him down by telling him stories and explaining that they are chill and will most def love him too. When you guys pull up he has to literally wait and take a few deep breaths before actually getting out. When you guys finally walk in he greets your father with a firm hand shake and gives your mother a warm hug. He's very polite the whole time a lot of "ma'am"s and "sir"s. He doesn't touch you at all; not even hand holding because he's afraid they may not like that in front of them and he's a v shy boy. In conclusion it went 10/10 he's a good boy and your parents told you they approve and he got kinda cocky but in a good way!
This bitch would be cocky as hell. He wouldn't be nervous at all. "Oh? Want me to meet the fam? Ight let's go right now I'm ready hoe." He'd be sososo sweet to your family. He'd give cliche compliments to you mom like "oh what?! I thought you were her sister!!" And basically is a kiss ass, but it works and you find it funny and cute. He bonds with your dad by making conversation about something they both like; maybe sports or something if your dad is musical or artistic then maybe that! He probably showed up with some kind of gift too. He's old enough now, so maybe some kind of nice wine to show them he has class as well as ass (even though he don't got that but it's fine we stan a skinny legend). Overall it went great! Everyone loved him and they even invited him back right there to his face and of course he said he'd love to.